The family of the 18-year-old student who stabbed four people at the University of California, Merced, last week before being killed by police expressed sympathy to the victims, a short statement released Tuesday said.

Faisal Mohammad, a freshman from Santa Clara, California, was a "kind and respectful young man," family members said in their first comments since the attack last Wednesday.

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"He was always quiet and humble and excelled in school and academics," according to the statement released through San Jose attorney Daniel Mayfield. "His teachers and friends always spoke well of him."

The family also thanked their friends for support and requested privacy.

Authorities have said that Mohammad had no previous run-ins with police and no clues in his past behavior to indicate that he would try to kill his classmates as revenge for being kicked out of a study group.

All the victims are expected to recover.

Merced County Sheriff Vern Warnke has said that Mohammed was not on anyone's radar. Investigators did not find evidence of mental illness or signs that he would be prone to bloodshed.

Mohammad stabbed two students, a university employee and a construction contractor credited with interrupting the attack before campus police shot him to death. Mohammad had written a two-page manifesto found on his body that detailed his plan to bind students to their desks with zip-tie handcuffs.

Then, he was going to make a fake 911 distress call, ambush responding officers with the hunting knife he carried and steal their guns to shoot a list of targeted classmates, including those in his study group.

Warnke called the plan the delusions of an angry young man, saying Mohammad wanted to do more harm but had little capacity to carry it out.

Nothing from Mohammad's childhood pointing to a propensity for violence, investigators said.

Background checks with help from the FBI and Department of Homeland Security showed no connections to organized hate or terror groups, the sheriff said.

The FBI released a statement Tuesday in connection to the UC Merced stabbing investigation, saying the agency works with local and state law enforcement, to provide briefings about current terrorist threats in the region from different groups.

“However, the FBI did not provide any briefing about specific threats to UC Merced or the student assailant,” the statement said. “Furthermore, the FBI did not have any derogatory information on [Mohammad], he was not the subject of an FBI investigation, and he was not located in FBI files prior to this incident.”

The FBI said it is working with the UC Merced Police Department and the Merced County Sheriff’s Department in order to "support a comprehensive investigation that will provide answers, not assumptions."

“The safety and security of our campus is the highest priority,” UC Merced Police Chief Albert Vasquez said in a statement. “I want to thank the FBI and the Merced County Sheriff’s Office for their on-going support and collaboration during this difficult time."

As the investigation continues, the FBI will not be releasing details on the evidence collected.

"The FBI is in search of answers and will not speculate about a motive and appreciate the public’s patience as we continue this significant task," the agency said.

The FBI said it is not aware of any other threats to the UC Merced campus.

Read Mohammad's family's full statement released through their attorney below:

The family of Faisal Mohammad wishes to thank their friends for their support in this time of grief.

We also want to express our deepest sympathy to the victims on campus at UC Merced.

Faisal was a kind and respectful young man. He was always quiet and humble and excelled in school and academics. His teachers and friends always spoke well of him.

At a time like this our family, like any family, requests privacy. Please allow us to grieve and remember our son, brother, cousin and friend in private.